Downloading Fieldlines 2.1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Nick Zitzmann.
The following version: 1.2 is the most frequently downloaded one by the program users. The program lies within Theming Tools, more precisely Screensavers. The application's installer is commonly called FieldLines1.2.1.dmg. We recommend checking the downloaded files with any free antivirus.
From the developer:
FieldLines is a screen saver that simulates the electric field lines emitted by charged particles. In this screen saver, ions move around the screen and bind to the lines of other ions as they get close and unbind as they move away. FieldLines is available in English, French, and Italian.
You may want to check out more Mac applications, such as scarytime v9, Christmas Tree Creator '04 or System47, which might be related to Fieldlines.